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Organization Skin Epidermis Dermis Accessory Structures Hair & Hair follicles

Organization Skin Epidermis Dermis Accessory Structures Hair & Hair follicles Exocrine glands Arrector pili Sensory Receptors. Layers beneath the skin Subcutaneous layer Deep fascia ________________________. Functions of the Skin Protection Water-resistance

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Organization Skin Epidermis Dermis Accessory Structures Hair & Hair follicles

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  1. Organization • Skin • Epidermis • Dermis • Accessory Structures • Hair & Hair follicles • Exocrine glands • Arrector pili • Sensory Receptors

  2. Layers beneath the skin • Subcutaneous layer • Deep fascia ________________________

  3. Functions of the Skin • Protection • Water-resistance • Temperature regulation • Vitamin D synthesis • Sensations • Immunity • Social signaling

  4. The Epidermis • Stratum Germinativum • Stem cells • Melanocytes • Merkel cells

  5. The Epidermis • S. Spinosum • “Pre-keratinocytes” • Melanocytes • Langerhans cells

  6. The Epidermis • S. Granulosum • S. Lucida • Keratinocytes in both layers

  7. The Epidermis • S. Corneum • Dead keratinocytes

  8. Skin cell-eating mite

  9. The Dermis

  10. The Dermis • Reticular layer • Dense irregular CT • Provides strength and elasticity

  11. The Dermis • Papillary layer • Areolar CT • Contains cap’s and sensory neurons for epidermis • Arranged as dermal papillae

  12. Pigmentation • Melanin • Carotene • Hemoglobin

  13. Epidermal Derivatives • Hair Follicles and Hair • Skin Glands

  14. Hair • Function • Protection • Touch Sensation • Structure • Root • Shaft • Bulb

  15. Hair • Hair Follicle • Sheath of epithelial cells • Surrounds root • Merges with bulb

  16. Hair • Associated structures • Dermal papilla • Sebaceous glands • Arrector pili

  17. Hair • Growth Cycle • 2-5 yrs: growth stage • 2 yrs: resting stage

  18. Sebaceous glands secrete sebum help to protect hair and skin Skin Glands

  19. Merocrine (eccrine) sweat glands BT control excretion protection Skin Glands

  20. Skin Glands • Apocrine sweat glands • Secrete pheromones?

  21. Skin Glands • Mammary glands • Ceruminous glands

  22. Skin Sensory Receptors • Free nerve endings • Pacinian corpuscles • Meissner’s corpuslces

  23. Lines of Cleavage

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